$75.95

The Visual Tactile Conventional Machining Microfinish Comparator Surface Roughness Scale is made by a dual electroforming process wherein nickel is electrodeposited to provide an exact reproduction in intricate detail. The same electroforming process used to produce the Surface Roughness

The surfaces used in this scale are reproductions of accurately machined surfaces measured in microinches (millionths of an inch 0.000001"). The numbers engraved alongside each surface are the average deviation from the mean surface expressed in microinches.

There are twelve replicated machined surface finish specimens with examples of five different machining processes: lapped, ground, profiled, shape-turned and milled- ranging from 4 to 125 microinches.

The Conventional Machining Microfinish Comparator is supplied in a leatherette case with engineering data and instructions.

The comparator is also available in metric with micrometer designations.

The Conventional Machining Microfinish Comparator Surface Roughness Scale provides an economical tool which permit roughness to be specified on the same basis as linear measurements. The surfaces presented are the result of years of research and engineering. Details covering this subject are now published in the American National Standards Institute (ANSI) specification titled: "Surface Texture, Surface Roughness , Waviness and Lay" ANSI/ASME B46.1

How to use the comparator:

Place the Comparator Surface Roughness Scale alongside your work piece. Slide the scale so that the rectangle with the surface roughness you want is adjacent to the piece you are examining. Compare by drawing the tip of the fingernail across each surface at right angles to the tool mark. The feel of the fingernail contact must be the same if the finishes are identical.

Individually serialized, calibrated and certified comparators are available from Engineers Edge at an additional charge. These prices are subject to change without notice. Contact Engineers Edge to determine current price and lead time - Contact Form